Didache c. 100 ADDidache 11
Every apostle who comes to you is to be received as the Lord. But he must not stay more than one day; if there is need, a second as well. If he stays three days, he is a false prophet. ... Not everyone who speaks in the Spirit is a prophet, but only one who has the ways of the Lord. By their ways, then, the false prophet and the prophet will be known. ... Any prophet who teaches the truth but does not do what he teaches is a false prophet. ... If anyone says in the Spirit, 'Give me money' or anything else, do not listen to him.
About 100: travelling apostles and prophets are part of ordinary church life, and they are tested by conduct, not by their claims: how long they stay, whether they ask for money for themselves, whether they practice what they teach. A prophet speaking in the Spirit is not to be tested on the spot (11.7); if he asks for help for others in need, no one is to judge him (11.12).